Current discharge method, device and equipment of overvoltage protection device and storage medium

Abstract

The invention relates to the technical field of high voltage, in particular to a current discharge method, device and equipment for an overvoltage protection device and a storage medium, and the method comprises the steps: converting an alternating current signal in the overvoltage protection device into a direct current signal through a rectifier bridge; converting the direct current signal into a voltage signal by using a current-to-voltage module, and judging whether the voltage signal is greater than a preset voltage threshold value or not through a voltage comparator; and if the voltage signal is greater than the preset voltage threshold value, controlling the to-be-controlled thyristor to be switched on by using the monostable circuit so as to perform current discharge. Therefore, the problems that the thyristor controller in the comprehensive protection device of the overhead transmission line ground wire induction energy taking equipment is easily influenced by overvoltage, the response speed is related to the clock signal frequency of the microcontroller, and the energy consumption and the cost are relatively high are solved, the response speed of the thyristor controller can be improved, the reliability is enhanced, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of high voltage technology, and in particular to a current discharge method, device, equipment and storage medium for an overvoltage protection device. Background Art

[0002] Overhead lines are the "arteries" of the power system. Due to their wide coverage, complex terrain along the route, frequent extreme weather and human factors, line failures are the main cause of power grid failures. Online monitoring devices are key equipment for realizing the digitization of transmission lines and building new power systems. They help to quickly eliminate line faults and discover hidden dangers in a timely manner, and can greatly improve the efficiency of line operation and maintenance. The reliable operation of online monitoring devices is inseparable from a stable power supply, and common online power supply technologies all have certain problems. Solar power cannot obtain enough electricity in long-term rainy weather or in mountainous areas that are shrouded in clouds and fog all year round; the installation, maintenance and use of electromagnetic induction power generation by wires are extremely inconvenient, and it is impossible to power online monitoring devices at ground potential; the cost of setting up dedicated low-voltage lines for online monitoring devices is high, and it is difficult to promote them in areas with complex terrain; the cost of wireless power transmission is high, the energy transmission efficiency is low, and it is difficult to meet the power demand of online monitoring devices. Therefore, online energy extraction methods based on ground wire induction have received widespread attention and research.

[0003] Based on ground wire induction, the online energy extraction scheme that uses the conductor current to generate voltage at both ends of the segmented insulated ground wire insulator is generally oriented to the ground wire operation mode in which one ground wire is segmented and grounded at a single point, and the other ground wire is grounded tower by tower. The energy extraction equipment is installed at both ends of the segmented insulated ground wire insulator at the energy extraction point. Its basic principle is to use the mutual inductance coupling between the transmission line conductor and the ground wire. The current on the conductor will generate an electromotive force at both ends of the insulator of the segmented insulated ground wire through the mutual inductance of the conductor and the ground wire to achieve energy extraction, and then pass through the rectification and voltage stabilization equipment to provide stable power supply for the detection equipment. This method does not require additional energy input and is an environmentally friendly, efficient and sustainable power supply method. However, since the energy extraction device based on ground wire induction is installed on the top of the line tower, the probability of it facing overvoltage is much higher than other devices installed in the conductor or the middle section of the tower. When lightning strikes a pole tower or the middle section of a lightning protection line, the impact current rushes into the energy collection equipment. When lightning strikes a conductor, the lightning current in the conductor is induced by the ground wire to generate overvoltage at both ends of the ground wire insulator. When the conductor is short-circuited in a single phase or between phases due to tree barriers, wildfires, or dancing, the conductor short-circuit current will cause a sudden increase in the electromotive force at both ends of the ground wire insulator. These overvoltage conditions may cause serious damage to the energy collection equipment. Therefore, it is very necessary to design a matching protection circuit for the energy collection equipment.

[0004] In the related technology, the research on overvoltage protection schemes for energy-collecting equipment based on ground wire induction is mainly aimed at overvoltage conditions caused by lightning strikes, short-term phase-to-ground short circuits, transformer switching operations, etc. A three-level surge protection device for lightning strike scenarios is proposed. By setting a protection device with a step-by-step decreasing action voltage to weaken the lightning current impact, it has a better protection capability against lightning impacts.

[0005] However, for the overvoltage caused by the short-circuit fault of the transmission line conductor, the related technology has not proposed a reliable protection scheme for the system; in actual operation, the duration of the phase-to-ground short circuit of the transmission line may reach more than 1s, which is much longer than the 300ms considered in the design of the device. Another related technology proposes a comprehensive overvoltage protection system for the ground wire energy extraction device, such as Figure 1 As shown, comprehensive protection is achieved against lightning strikes and power frequency overvoltage conditions. However, the control of the thyristor devices in the protection circuit is implemented by a microcontroller unit, which has high energy consumption during operation, and its response speed is limited by the clock frequency. In addition, the cost is high, which needs to be solved urgently. Summary of the invention

[0006] The present application provides a current discharge method, device, equipment and storage medium for an overvoltage protection device to solve the problems of the thyristor controller in the comprehensive protection device of the overhead transmission line ground wire induction energy extraction equipment being susceptible to overvoltage, the response speed being related to the microcontroller clock signal frequency, and the high energy consumption and cost. The thyristor controller can be improved in terms of response speed, reliability and cost.

[0007] The first aspect of the present application provides a current discharge method for an overvoltage protection device, wherein the overvoltage protection device is connected to a thyristor controller, the thyristor controller comprises a rectifier bridge, a current-voltage conversion module, a voltage comparator, a monostable circuit and a solid-state relay connected in sequence, the rectifier bridge is connected to the overvoltage protection device, and the solid-state relay is connected to the thyristor to be controlled, wherein the method comprises the following steps:

[0008] The rectifier bridge is used to convert the AC current signal in the overvoltage protection device into a DC current signal;

[0009] The DC current signal is converted into a voltage signal by using the current-to-voltage module, and whether the voltage signal is greater than a preset voltage threshold is determined by using the voltage comparator;

[0010] If the voltage signal is greater than the preset voltage threshold, the monostable circuit is used to control the thyristor to be controlled to be turned on to discharge the current.

[0011] Optionally, in some embodiments, controlling the conduction of the thyristor to be controlled by using the monostable circuit includes:

[0012] Utilizing the voltage comparator to output a trigger signal;

[0013] The monostable circuit is used to control the solid-state relay to output a delayed activation signal based on the trigger signal, so that the thyristor to be controlled is turned on based on the delayed activation signal.

[0014] Optionally, in some embodiments, after using the monostable circuit to control the thyristor to be controlled to be turned on, the method further includes:

[0015] Obtaining the conduction time length of the thyristor to be controlled;

[0016] When the conduction time is longer than a preset time, the solid-state relay is controlled to be disconnected to turn off the thyristor to be controlled.

[0017] Optionally, in some embodiments, when the voltage signal is greater than the preset voltage threshold, the method further includes:

[0018] An overvoltage reminder signal is generated, and an overvoltage reminder is performed according to the overvoltage reminder signal.

[0019] Optionally, in some embodiments, it further includes:

[0020] A preset DC isolated power supply is used to power the current-voltage conversion module, the voltage comparator, the monostable circuit and the solid-state relay.

[0021] A second aspect of the present application provides a current discharge device of an overvoltage protection device, wherein the overvoltage protection device is connected to a thyristor controller, wherein the thyristor controller includes a rectifier bridge, a current-voltage conversion module, a voltage comparator, a monostable circuit, and a solid-state relay connected in sequence, wherein the rectifier bridge is connected to the overvoltage protection device, and the solid-state relay is connected to the thyristor to be controlled, wherein the current discharge device of the overvoltage protection device includes:

[0022] A conversion module, used to convert the AC current signal in the overvoltage protection device into a DC current signal using the rectifier bridge;

[0023] A judging module, configured to convert the DC current signal into a voltage signal by using the current-to-voltage module, and to judge whether the voltage signal is greater than a preset voltage threshold by using the voltage comparator;

[0024] The discharge module is used to control the thyristor to be controlled to be turned on by using the monostable circuit when the voltage signal is greater than the preset voltage threshold, so as to discharge the current.

[0025] Optionally, in some embodiments, the discharge module includes:

[0026] A trigger unit, used to output a trigger signal using the voltage comparator;

[0027] A conduction unit is used to control the solid-state relay to output a delayed activation signal based on the trigger signal using the monostable circuit, so that the thyristor to be controlled is turned on based on the delayed activation signal.

[0028] Optionally, in some embodiments, after the monostable circuit is used to control the thyristor to be controlled to be turned on, the turning-on module further includes:

[0029] An acquisition unit, used for acquiring the conduction time length of the thyristor to be controlled;

[0030] The shutoff unit is used to control the solid-state relay to be disconnected when the conduction time is longer than a preset time, so as to shut off the thyristor to be controlled.

[0031] Optionally, in some embodiments, an overvoltage reminder signal is generated, and when the voltage signal is greater than the preset voltage threshold, the discharge module further includes:

[0032] The reminder unit is used to generate an overvoltage reminder signal and perform an overvoltage reminder according to the overvoltage reminder signal.

[0033] Optionally, in some embodiments, the current discharge device of the above-mentioned overvoltage protection device further includes:

[0034] A power supply module is used to use a preset DC isolated power supply to power the current-voltage conversion module, the voltage comparator, the monostable circuit and the solid-state relay.

[0035] A third aspect of the present application provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the current discharge method of the overvoltage protection device as described in the above embodiment.

[0036] A fourth aspect of the present application provides a computer-readable storage medium having a computer program stored thereon, the program being executed by a processor to implement the current discharge method of the overvoltage protection device as described in the above embodiment.

[0037] Thus, the AC current signal in the overvoltage protection device is converted into a DC current signal by using a rectifier bridge; the DC current signal is converted into a voltage signal by using a current-to-voltage module, and the voltage comparator is used to determine whether the voltage signal is greater than a preset voltage threshold; if the voltage signal is greater than the preset voltage threshold, the monostable circuit is used to control the thyristor to be controlled to conduct to discharge the current. Thus, the problems of the thyristor controller in the integrated protection device for overhead transmission line ground wire induction energy extraction equipment being susceptible to overvoltage, the response speed being related to the frequency of the microcontroller clock signal, and the high energy consumption and cost are solved, and the response speed of the thyristor controller can be improved, the reliability can be enhanced, and the cost can be reduced.

[0038] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0040] Figure 1 is a schematic diagram of an overvoltage protection device according to the related art;

[0041] Figure 2 A schematic diagram of a thyristor controller provided according to an embodiment of the present application;

[0042] Figure 3 A flow chart of a current discharge method of an overvoltage protection device provided according to an embodiment of the present application;

[0043] Figure 4 A schematic diagram of the control logic of a thyristor controller provided according to an embodiment of the present application;

[0044] Figure 5 A schematic diagram of a simulation model of a thyristor controller provided according to an embodiment of the present application;

[0045] Figure 6 A schematic diagram of the spatial relative position of a ground wire provided according to an embodiment of the present application;

[0046] Figure 7 A schematic diagram of the triggering time of a simulation model of a thyristor controller provided according to an embodiment of the present application;

[0047] Figure 8 A schematic diagram of energy discharge of an SPD device according to a simulation model of a thyristor controller provided in accordance with an embodiment of the present application;

[0048] Fig. 9A schematic diagram of an SPD device current of a simulation model of a thyristor controller provided according to an embodiment of the present application;

[0049] Fig.10 A schematic diagram of an experimental model of a thyristor controller provided according to an embodiment of the present application;

[0050] Fig.11 A schematic diagram of experimental results of a thyristor controller provided according to an embodiment of the present application;

[0051] Fig.12 A block diagram of a current discharge device of an overvoltage protection device provided according to an embodiment of the present application;

[0052] Fig.13 It is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0053] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0054] Before introducing the current discharge method of the overvoltage protection device of the embodiment of the present application, the overvoltage protection device in the related art is first introduced.

[0055] In the related technology, the effective protection device of the online energy-taking equipment of the overhead transmission line based on ground wire induction mainly protects against overvoltage conditions with very short action time. The characteristics of such working conditions are that the action time is several microseconds or milliseconds, the peak voltage can be as high as tens of kilovolts, but the total energy acting on the surge protector is not large. However, when a single-phase ground short circuit or a phase-to-phase short circuit occurs in the overhead transmission line, the surge protection device continues to operate, and the current flowing through it can reach hundreds of amperes. The surge protection device will fail and burn out within tens of milliseconds, and in extreme cases, the fault on the line may take hundreds of milliseconds or even seconds to be detected and tripped.

[0056] Another related technology of the ground wire energy extraction device integrated overvoltage protection system can achieve comprehensive protection against the above two overvoltage conditions under two working conditions. However, the on and off of the thyristor as the power frequency current discharge switch is realized by the micro control unit. The problems of this method are as follows: (1) When the ground wire of the overhead transmission line is struck by lightning, even after attenuation by a multi-stage buffer network, a voltage shock with a peak value of hundreds of volts may still be generated at the load port. Since the micro control unit is directly powered by the ground wire energy extraction device, the overvoltage may flow into the control unit and cause damage to it, causing the device to lose its protection capability under power frequency overvoltage; (2) The response speed of the micro control unit is affected by its clock frequency. When the clock frequency is low, it may take several milliseconds to realize signal recognition and thyristor triggering. During this period, there is a risk of overheating of the SPD device due to excessive current flowing through it. When the clock frequency is high, the energy consumption of the micro control unit will increase significantly, and the equipment failure rate will also increase accordingly; (3) The cost of micro control units is generally high.

[0057] In view of the above problems, the present application provides a current discharge method for an overvoltage protection device, in which the AC current signal in the overvoltage protection device is converted into a DC current signal by using a rectifier bridge; the DC current signal is converted into a voltage signal by using a current-to-voltage module, and a voltage comparator is used to determine whether the voltage signal is greater than a preset voltage threshold; if the voltage signal is greater than the preset voltage threshold, a monostable circuit is used to control the conduction of the thyristor to be controlled to discharge the current. Thus, the problems of the thyristor controller in the integrated protection device for overhead transmission line ground wire induction energy extraction equipment being susceptible to overvoltage, the response speed being related to the frequency of the microcontroller clock signal, and the high energy consumption and cost are solved, and the response speed of the thyristor controller can be improved, the reliability can be enhanced, and the cost can be reduced.

[0058] It should be noted that the current discharge method of the overvoltage protection device of the embodiment of the present application adopts a thyristor controller. Before introducing the current discharge method of the overvoltage protection device of the embodiment of the present application, the thyristor controller is first introduced. Figure 2 As shown, the thyristor controller of the embodiment of the present application includes a rectifier bridge, a current-voltage conversion module, a voltage comparator, a monostable circuit and a solid-state relay connected in sequence, wherein the rectifier bridge is connected to the overvoltage protection device, and the solid-state relay is connected to the thyristor to be controlled.

[0059] Specifically, Figure 3 A schematic flow chart of a current discharge method of an overvoltage protection device provided in an embodiment of the present application.

[0060] like Figure 3 As shown, the current discharge method of the overvoltage protection device includes the following steps:

[0061] In step S101, an AC current signal in an overvoltage protection device is converted into a DC current signal by using a rectifier bridge.

[0062] Specifically, the input of the thyristor controller is a current transformer (CT) connected in series in the main circuit of the overvoltage protection device, which converts the AC current signal into a DC current signal through a rectifier bridge.

[0063] In step S102, a current-to-voltage module is used to convert a DC current signal into a voltage signal, and a voltage comparator is used to determine whether the voltage signal is greater than a preset voltage threshold.

[0064] The preset voltage threshold may be pre-set by a user, obtained through a limited number of experiments, or obtained through a limited number of computer simulations, which is not specifically limited here.

[0065] Specifically, after the AC current signal in the overvoltage protection device is converted into a DC current signal using a rectifier bridge, the DC current signal is converted into a voltage signal by the current-voltage conversion module and transmitted to the voltage comparator. The voltage comparator has a preset voltage threshold, and the voltage comparator is used to determine whether the voltage signal is greater than the preset voltage threshold.

[0066] In step S103 , if the voltage signal is greater than a preset voltage threshold, the monostable circuit is used to control the thyristor to be controlled to be turned on to discharge the current.

[0067] Further, in some embodiments, using a monostable circuit to control the conduction of the thyristor to be controlled includes: using a voltage comparator to output a trigger signal; using the monostable circuit to control a solid-state relay to output a delayed activation signal based on the trigger signal, so that the thyristor to be controlled is turned on based on the delayed activation signal.

[0068] Specifically, if the voltage signal exceeds a preset voltage threshold, the voltage comparator sends a trigger signal to the monostable circuit, and the monostable circuit controls the solid-state relay to output a delayed activation signal based on the trigger signal, so that the thyristor to be controlled is turned on based on the delayed activation signal to discharge current.

[0069] Optionally, in some embodiments, after using a monostable circuit to control the conduction of the thyristor to be controlled, it also includes: obtaining the conduction time of the thyristor to be controlled; when the conduction time is greater than a preset time, controlling the solid-state relay to disconnect to turn off the connection of the thyristor to be controlled.

[0070] The preset duration may be pre-set by a user, obtained through a limited number of experiments, or obtained through a limited number of computer simulations, and is not specifically limited here.

[0071] It can be understood that the embodiment of the present application can pre-set the conduction time. When the conduction time is greater than the preset time, the current is discharged, ensuring that the fault on the line has been eliminated. Specifically, after the thyristor to be controlled is turned on based on the delayed activation signal, the embodiment of the present application obtains the conduction time. When the conduction time is greater than the preset time, the solid-state relay is controlled to disconnect to shut down the thyristor to be controlled and stop the current discharge.

[0072] Optionally, in some embodiments, when the voltage signal is greater than a preset voltage threshold, the method further includes: generating an overvoltage reminder signal, and performing an overvoltage reminder according to the overvoltage reminder signal.

[0073] Specifically, in order to further enhance the safety and reliability of the overvoltage protection device, when the voltage signal exceeds the preset voltage threshold, in addition to activating the thyristor, an overvoltage reminder signal can also be generated, and an overvoltage reminder can be performed according to the signal. For example, when the voltage signal exceeds the preset threshold, an overvoltage reminder signal is generated, and a corresponding reminder operation is performed according to the overvoltage reminder signal, wherein the reminder operation may include: visual reminder, auditory reminder and remote reminder. For example, (1) the embodiment of the present application indicates the overvoltage state by an indicator light (such as a red LED). When the overvoltage reminder signal is activated, the indicator light is on to remind the operator or the monitoring system to pay attention to the overvoltage situation; (2) the embodiment of the present application can use a buzzer to sound an alarm. When the overvoltage reminder signal is activated, the buzzer sounds an alarm to remind the operator or the monitoring system to pay attention to the overvoltage situation; (3) the embodiment of the present application can send the overvoltage reminder signal to a remote monitoring system, and transmit the overvoltage information to the control center through a network or wireless communication module to achieve remote monitoring and alarm. Therefore, when the voltage signal is greater than a preset voltage threshold, an overvoltage reminder signal is generated and an overvoltage reminder is performed, which can significantly improve the safety and reliability of the system.

[0074] Optionally, in some embodiments, it also includes: utilizing a preset DC isolation power supply to power the current-voltage conversion module, the voltage comparator, the monostable circuit and the solid-state relay.

[0075] Specifically, Figure 2 As shown in the battery icon in the figure, the embodiment of the present application supplies power to the current-voltage conversion module, the voltage comparator, the monostable circuit and the solid-state relay through a preset DC isolation power supply. In addition, the thyristor controller in the embodiment of the present application may also involve a power supply voltage stabilizing module, which supplies power to the remaining functional elements through the power supply voltage stabilizing module to improve the stability of the controller.

[0076] Therefore, combined with Figure 4As shown, in the embodiment of the present application, a current probe can be set up, and the current in the main circuit of the overvoltage protection device can be measured by the current probe, and the measured current can be transmitted to the thyristor controller for sampling and comparison. If the current in the main circuit of the overvoltage protection device exceeds the preset threshold value, it indicates that an abnormal increase in current occurs in the main circuit of the overvoltage protection device. At this time, a closing relay signal is generated to control the relay to close, thereby triggering the thyristor. After a certain delay, the thyristor ensures that the fault on the line has been eliminated, controls the relay to disconnect, and re-measures the current in the main circuit of the overvoltage protection device. Therefore, the current discharge method of the overvoltage protection device in the embodiment of the present application improves the response speed of the thyristor, improves the reliability of the overvoltage protection device, and reduces the control cost.

[0077] In order to enable relevant technical personnel in the field to further understand the current discharge method of the overvoltage protection device of the embodiment of the present application, it is elaborated in detail below in combination with specific embodiments.

[0078] The embodiment of the present application is based on PSCAD-EMTDC simulation software. Figure 1 The overvoltage protection device in the simulation software is used to build a simulation model with the same parameters, and according to Figure 2 The structure design in the above example builds a matching thyristor controller and obtains the following Figure 5 The simulation circuit diagram is shown.

[0079] When a short circuit fault occurs in the operation of the transmission line, due to the mutual coupling between the ground wires, single-point grounding, and the voltage generated at both ends of the segmented insulated ground wire insulator may be as high as ten kilovolts or higher. The relevant parameters of the simulation example in the embodiment of the present application are as follows: for a 110kV single-circuit line, the tower model is 1XZA1-ZBC1 wine glass tower, which is suitable for a horizontal span of about 350m. The ground wire model is JLB20A-100, with an outer diameter of 13mm and a DC resistance of 0.85242Ω / km. The conductor model is JL / G1A-185 / 30, with an outer diameter of 18.9mm and a DC resistance of 0.15922Ω / km. Under the above-mentioned line and tower parameter selection, the spatial relative position of the ground wire is as follows: Figure 6 shown.

[0080] In the simulation, the length of the ground wire insulator string is set to 0.73m, and the distance of the gas gap in parallel with the ground wire insulator is 12mm. According to the relationship table between the parallel gap length and the flashover voltage, the flashover voltage is about 22kV. The simulation design line span is 350m, and each tension section has 10 sections. There are two tension sections in the simulation example. The energy extraction device is located on the ninth non-tension tower of the first section, close to the central tension tower. The tower adopts a multi-wave impedance model according to the relative position of the ground wire, the grounding resistance is set to 15Ω, and the line current is set to 100A in the steady state. The simulation is based on PSCAD-EMTDC software, and the main overhead line short-circuit fault situation is analyzed. The load in the circuit is replaced by a 10Ω resistor.

[0081] The simulation conditions of transmission line faults mainly consider single-phase grounding, two-phase short circuit and three-phase short circuit. The fault point is set in the middle of the line adjacent to the energy extraction point, far away from the power supply side. The typical value of the short-circuit resistance is set to 3Ω, the fault is set to occur at 0.1s, when the system has reached a steady state, the fault time is set to 0.5s, and the fault type is set to C3 conductor single-phase grounding short circuit. The simulation focuses on the controller response speed and records the energy generated on each SPD device.

[0082] like Figure 7 , Figure 8 and Fig. 9 As shown, about 10ms after the wire short circuit fault occurs, the controller gives a signal to turn on the thyristor, and the total energy discharged by the SPD device during the whole process does not exceed 2kJ, which can be tolerated by most SPD devices.

[0083] The effectiveness of the embodiment of the present application is also verified by experiments. In the experiments, a current source is used to simulate the current of the main circuit of the protection device. By increasing the current of the current source, the current surge in the main circuit under power frequency overvoltage is simulated. Fig.10 As shown, the experimental waveform is as follows Fig.11 As shown, the yellow waveform is the current source output current (power frequency), and the blue waveform is the current waveform flowing through the thyristor. It can be seen that when the current source current exceeds the threshold value for about 5ms, the thyristor is triggered, which is basically consistent with the simulation results. Combining the experimental and simulation results, the thyristor controller in the overvoltage protection device achieves good protection performance. At the same time, the controller is mainly composed of logic circuit chips, and the complexity is greatly reduced compared to the microcontroller, and the reliability of the controller is improved.

[0084] According to the current discharge method of the overvoltage protection device proposed in the embodiment of the present application, the AC current signal in the overvoltage protection device is converted into a DC current signal by using a rectifier bridge, and the DC current signal is converted into a voltage signal by using a current-to-voltage module, and the voltage comparator is used to determine whether the voltage signal is greater than a preset voltage threshold. When the voltage signal is greater than the preset voltage threshold, the monostable circuit is used to control the conduction of the thyristor to be controlled to discharge the current. Thus, the problems of the thyristor controller in the integrated protection device for overhead transmission line ground wire induction energy extraction equipment being susceptible to overvoltage, the response speed being related to the frequency of the microcontroller clock signal, and the high energy consumption and cost are solved, and the response speed of the thyristor controller can be improved, the reliability can be enhanced, and the cost can be reduced.

[0085] Next, the current discharge device of the overvoltage protection device proposed in the embodiment of the present application is described with reference to the accompanying drawings.

[0086] Fig.12 Schematic diagram of a current discharge device of an overvoltage protection device according to an embodiment of the present application.

[0087] It should be noted that the overvoltage protection device of the embodiment of the present application is connected to the thyristor controller, which includes a rectifier bridge, a current-voltage conversion module, a voltage comparator, a monostable circuit and a solid-state relay connected in sequence, the rectifier bridge is connected to the overvoltage protection device, and the solid-state relay is connected to the thyristor to be controlled, such as Fig.12 As shown, the current discharge device 10 of the overvoltage protection device includes: a conversion module 100 , a judgment module 200 and a discharge module 300 .

[0088] The conversion module 100 is used to convert the AC current signal in the overvoltage protection device into a DC current signal by using a rectifier bridge.

[0089] The judgment module 200 is used to convert the DC current signal into a voltage signal by using the current-to-voltage module, and to judge whether the voltage signal is greater than a preset voltage threshold by using a voltage comparator.

[0090] The discharge module 300 is used to control the thyristor to be controlled to be turned on by using a monostable circuit to discharge current when the voltage signal is greater than a preset voltage threshold.

[0091] Optionally, in some embodiments, the discharge module 300 includes: a trigger unit and a conduction unit.

[0092] The trigger unit is used to output a trigger signal using a voltage comparator.

[0093] The conduction unit is used to control the solid-state relay to output a delayed activation signal based on a trigger signal using a monostable circuit, so that the thyristor to be controlled is turned on based on the delayed activation signal.

[0094] Optionally, in some embodiments, after the monostable circuit is used to control the thyristor to be controlled to be turned on, the turning-on module 300 further includes: an acquisition unit and a turning-off unit.

[0095] The acquisition unit is used to acquire the conduction time length of the thyristor to be controlled.

[0096] The shutoff unit is used to control the solid-state relay to disconnect when the conduction time is longer than a preset time, so as to shut off the thyristor to be controlled.

[0097] Optionally, in some embodiments, an overvoltage reminder signal is generated, and when the voltage signal is greater than a preset voltage threshold, the discharge module 300 further includes: a reminder unit.

[0098] The reminder unit is used to generate an overvoltage reminder signal and perform an overvoltage reminder according to the overvoltage reminder signal.

[0099] Optionally, in some embodiments, the current discharge device 10 of the above-mentioned overvoltage protection device further includes: a power supply module.

[0100] Among them, the power supply module is used to use a preset DC isolation power supply to power the current-voltage conversion module, the voltage comparator, the monostable circuit and the solid-state relay.

[0101] It should be noted that the above explanation of the embodiment of the current discharge method of the overvoltage protection device is also applicable to the current discharge device of the overvoltage protection device of this embodiment, and will not be repeated here.

[0102] According to the current discharge device of the overvoltage protection device proposed in the embodiment of the present application, the AC current signal in the overvoltage protection device is converted into a DC current signal by using a rectifier bridge, and the DC current signal is converted into a voltage signal by using a current-to-voltage module, and the voltage comparator is used to determine whether the voltage signal is greater than a preset voltage threshold. When the voltage signal is greater than the preset voltage threshold, the monostable circuit is used to control the conduction of the thyristor to be controlled to discharge the current. Thus, the problems of the thyristor controller in the integrated protection device for the overhead transmission line ground wire induction energy extraction equipment being susceptible to overvoltage, the response speed being related to the frequency of the microcontroller clock signal, and the high energy consumption and cost are solved, and the response speed of the thyristor controller can be improved, the reliability can be enhanced, and the cost can be reduced.

[0103] Fig.13 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device may include:

[0104] A memory 1301 , a processor 1302 , and a computer program stored in the memory 1301 and executable on the processor 1302 .

[0105] When the processor 1302 executes the program, the current discharge method of the overvoltage protection device provided in the above embodiment is implemented.

[0106] Furthermore, the electronic device further comprises:

[0107] The communication interface 1303 is used for communication between the memory 1301 and the processor 1302 .

[0108] The memory 1301 is used to store computer programs that can be executed on the processor 1302 .

[0109] The memory 1301 may include a high-speed RAM (Random Access Memory) memory, and may also include a non-volatile memory, such as at least one disk memory.

[0110] If the memory 1301, the processor 1302 and the communication interface 1303 are implemented independently, the communication interface 1303, the memory 1301 and the processor 1302 can be connected to each other through a bus and communicate with each other. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.13 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0111] Optionally, in a specific implementation, if the memory 1301, the processor 1302 and the communication interface 1303 are integrated on a chip, the memory 1301, the processor 1302 and the communication interface 1303 can communicate with each other through an internal interface.

[0112] The processor 1302 may be a CPU (Central Processing Unit), or an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present application.

[0113] An embodiment of the present application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the current discharge method of the overvoltage protection device as described above.

[0114] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0115] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0116] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0117] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array, a field programmable gate array, etc.

[0118] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0119] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A current discharge method for an overvoltage protection device, characterized in that: The overvoltage protection device is connected to a thyristor controller, which includes a rectifier bridge, a current-voltage conversion module, a voltage comparator, a monostable circuit and a solid-state relay connected in sequence, the rectifier bridge is connected to the overvoltage protection device, and the solid-state relay is connected to the thyristor to be controlled, wherein the method includes the following steps: The rectifier bridge is used to convert the AC current signal in the overvoltage protection device into a DC current signal; The DC current signal is converted into a voltage signal by using the current-to-voltage module, and whether the voltage signal is greater than a preset voltage threshold is determined by using the voltage comparator; If the voltage signal is greater than the preset voltage threshold, the monostable circuit is used to control the thyristor to be controlled to be turned on to discharge the current.

2. The method according to claim 1, characterized in that The method of controlling the conduction of the thyristor to be controlled by using the monostable circuit comprises: Utilizing the voltage comparator to output a trigger signal; The monostable circuit is used to control the solid-state relay to output a delayed activation signal based on the trigger signal, so that the thyristor to be controlled is turned on based on the delayed activation signal.

3. The method according to claim 2, characterized in that After the monostable circuit is used to control the thyristor to be controlled to be turned on, the method further includes: Obtaining the conduction time length of the thyristor to be controlled; When the conduction time is longer than a preset time, the solid-state relay is controlled to be disconnected to turn off the thyristor to be controlled.

4. The method according to claim 1, characterized in that: When the voltage signal is greater than the preset voltage threshold, the method further includes: An overvoltage reminder signal is generated, and an overvoltage reminder is performed according to the overvoltage reminder signal.

5. The method according to claim 1, characterized in that Also includes: A preset DC isolated power supply is used to power the current-voltage conversion module, the voltage comparator, the monostable circuit and the solid-state relay.

6. A current discharge device of an overvoltage protection device, characterized in that: The overvoltage protection device is connected to a thyristor controller, which includes a rectifier bridge, a current-voltage conversion module, a voltage comparator, a monostable circuit and a solid-state relay connected in sequence, the rectifier bridge is connected to the overvoltage protection device, and the solid-state relay is connected to the thyristor to be controlled, wherein the current discharge device of the overvoltage protection device includes: A conversion module, used to convert the AC current signal in the overvoltage protection device into a DC current signal using the rectifier bridge; A judging module, configured to convert the DC current signal into a voltage signal by using the current-to-voltage module, and to judge whether the voltage signal is greater than a preset voltage threshold by using the voltage comparator; The discharge module is used to control the thyristor to be controlled to be turned on by using the monostable circuit when the voltage signal is greater than the preset voltage threshold, so as to discharge the current.

7. The current discharge device of the overvoltage protection device according to claim 6, characterized in that: The discharge module comprises: A trigger unit, used to output a trigger signal using the voltage comparator; A conduction unit is used to control the solid-state relay to output a delayed activation signal based on the trigger signal using the monostable circuit, so that the thyristor to be controlled is turned on based on the delayed activation signal.

8. The current discharge device of the overvoltage protection device according to claim 7, characterized in that: After the monostable circuit is used to control the thyristor to be controlled to be turned on, the turn-on module further includes: An acquisition unit, used for acquiring the conduction time length of the thyristor to be controlled; The shutoff unit is used to control the solid-state relay to be disconnected when the conduction time is longer than a preset time, so as to shut off the thyristor to be controlled.

9. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the current discharge method for the overvoltage protection device according to any one of claims 1 to 5.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the current discharge method of the overvoltage protection device according to any one of claims 1 to 5.

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